black smoke when accelerate

Check for a vacuum leak on the right side. The oxygen sensor will detect the unburned oxygen, then the Engine Computer will command more fuel to that side. No matter how much fuel it keeps adding there will still be that extra oxygen there. The fault code will be "running lean" but you will see and smell the extra fuel.

Thank for you answer.
I think about vaccum leak, I hook vaccum gaugez and it show steady 18.7.also I replaced bank O2 sensors and on monitor numbers jump up and down both bank 1and 2 look like. what do you think ?
Do you think bank 2 catalytic converter no effiency, how to test catalytic converter for effiency?

Thank a lot for your help.

You won't find a vacuum leak with a gauge. First look at all of the hoses to see if any are cracked. To check for leaking intake manifold gaskets spray water on the running engine while it's still cold. Look for places it gets sucked in or causes the engine to slow down.

You don't have an efficiency problem with the catalytic converter. That would be detected by the Engine Computer and it would set a diagnostic fault code and turn on the Check Engine light. That would have nothing to do with how the four cylinders are running on the right side.